A professional plumber can use a special camera called a plumbing camera or drain camera to inspect pipes.
The camera is typically a small, waterproof device with a high-resolution lens and a light source. The plumber will thread the camera through the pipe and use a monitor to view the inside of the pipe in real-time. This allows the plumber to identify any issues such as blockages, leaks, or cracks that may be causing problems with the plumbing system.
They can also use this technology to find and locate specific points of interest such as a broken pipe or a clogged drain.
They can also record the video feed for later review or to provide evidence of the condition of the pipes to the customer.